零价铁对土壤中硝基苯类化合物的还原作用

用气相色谱-质谱联用仪(GC-MS)对零价铁在常温常压下还原3种土壤中对硝基苯和间二硝基苯进行了研究.结果表明,硝基苯类化合物转化为苯胺等化合物,对硝基苯和间二硝基苯2种化合物在黏土中的还原率分别达到91%和90%.不同土壤物理化学性质与硝基苯类化合物的还原率有密切关系,表现为黏土>轻壤土>砂土的规律;中性偏酸的土壤有利于硝基苯类化合物的还原和降解,降解率随有机质含量升高而增高.

Reduction action of zero-valent iron on nitrobenzene compounds in soils

The reduction of p-nitrobenzene (PNT) and m-dinitrobenzene (MDNB) in three kinds of soils by zero-valent iron (ZVI) at normal temperature and pressure was studied using gas chromatography-mass spectrometry (GC-MS). nitrobenzene compounds transformed into benzylamine compounds; the reduction rates of PNT and MDNB in clay were highest, reaching 91% and 90%, respectively. In addition, there was close relation between the physicochemical properties of different soils and the reduction rates of Nitrobenzene compounds, showing the rule of clay > light loam > sand. The soil of acidic of neutral pH value was favorable to the reduction and degradation of nitrobenzene compounds; the degradation rate increased with increase of organic matter content.